Lost foam casting technology leading sands to be compacter

Abstract

The invention discloses a lost foam casting technology leading sands to be compacter, comprising the following steps of foaming and gluing or combining, wherein in the foaming process, EPS or STMMA beads are foamed and amplified by about 30 times by a foaming machine to form raw materials for producing the mold; the raw materials for producing the mold are arranged in the cavity of the mold; and the forming equipment heats the raw materials for producing the mold in the cavity of the mold, thus forming a mold sheet; in the gluing or combining step, when the mold sheet can not form a casting model directly, a plurality of mold sheets are bonded to form a casting model cluster; and a gating system and the casting model or the casting model cluster are bonded to form a whole; subsequently the casting model or the casting model cluster is dipped and roasted; the resistance parts, at which the sands can enter or fill the casting model or the casting model cluster easily, can be determined; then the structure of the casting model or the casting model cluster is improved; and finally the processed casting model or the casting model cluster is embedded in free dry sand and is vibrated to be compact, and the metal liquid is poured to form the casting. The lost foam casting technology can reduce the sand entering and filling resistance in the vibration procedure by changing part of the structure of lost foam casting model or the casting model cluster, thus leading the sand to be compacter.

Description

[0001] Technical field: [0002] The invention mainly relates to the vibration process in lost foam casting, in particular to a lost foam casting process for making sand more compact. Background technique: [0003] Lost foam casting is a special casting process. The first step is foaming, that is, the foaming machine uses steam to expand EPS or STMMA beads by about 30 times to form the molding raw materials that need to be used in the molding process. The second step is molding, that is, the molding equipment uses steam to heat the molding material in the cavity of the mold to form a mold. The third step is gluing or combination. If the casting model cannot be directly formed by molding, multiple dies need to be bonded together to form a casting model cluster; then the gating system and the casting model or the casting model cluster are bonded into a whole. The fourth step is to dip-coat and dry the casting model or the casting model cluster. The fifth step is to bury ...

AI Technical Summary

Problems solved by technology

During the vibration process of lost foam casting, due to the resistance in the sand feeding process, the local sand vibration of the casting is often not compacted; Variety

The existing technology is to increase the vibration time, or pre-fill the parts that are not suitable for sand entry with self-hardening sand (such as resin sand or water glass sand); but these all cause inconvenience to mass production